With the continuous development of modern manufacturing technology, making the traditional manufacturing industry has undergone great changes, CNC technology, mechatronics and industrial robots in the production of more widely used. At the same time, the positioning accuracy, guiding accuracy and feed speed of the mechanical transmission mechanism is constantly improving, so that the traditional guiding mechanism has undergone significant changes. Since its commercialization in 1973, rolling linear guide vice with its unique characteristics, gradually replaced the traditional sliding linear guide, in industrial production has been widely used. Adapted to today's machinery for high precision, high speed, energy saving and shorten the product development cycle requirements, has been widely used in a variety of heavy combination of machine tools, CNC machine tools, high-precision EDM cutting machines, grinding machines, industrial robots and even general industrial machinery.
Rolling linear guideway sub performance characteristics
1. High positioning accuracy Rolling linear guideway movement with the help of steel ball rolling to achieve, guideway sub frictional resistance is small, static and dynamic friction resistance difference is small, low-speed is not easy to produce crawling. Repeat positioning accuracy is high, suitable for frequent start or change direction of the moving parts. Machine positioning accuracy can be set to ultra-micron level. At the same time, according to the need to appropriately increase the preload, to ensure that the steel ball does not slide, to achieve smooth movement, reducing the impact of the movement and vibration. 2. Low wear and tearFor fluid lubrication of sliding guideway surfaces, due to the floating of the oil film, the resulting error in motion accuracy is unavoidable. In the vast majority of cases, fluid lubrication is limited to the boundary area, by the metal contact and the direct friction is unavoidable, in this kind of friction, a large amount of energy to friction loss is wasted. In contrast, rolling contact due to friction energy consumption is small, the rolling surface of the friction loss is also reduced accordingly, so it can make the rolling linear guide system in a high-precision state for a long time. At the same time, due to the use of lubricant is also very little, which makes the machine tool lubrication system design and use of maintenance have become very easy.
3. Adapt to high-speed movement and greatly reduce the drive power The use of rolling linear guide machine tools due to frictional resistance is small, so that the required power source and power transmission mechanism miniaturization, so that the drive torque is greatly reduced, so that the machine tool power required to reduce the 80%, energy saving effect is obvious. High-speed movement of the machine tool can be realized to improve the efficiency of the machine tool 20 ~ 30%. 4. Strong carrying capacity Rolling linear guide vice has a good bearing performance, can withstand different directions of force and moment load, such as bearing up and down the left and right direction of the force, as well as bumps moment, shaking moment and swinging moment. Therefore, it has good load adaptability. In the design and manufacture of appropriate preload can increase the damping to improve vibration resistance, while eliminating high-frequency vibration phenomenon. The sliding guide in the direction of the parallel contact surface can withstand the lateral load is small, easy to cause the machine tool running accuracy is poor. 5. Easy to assemble and interchangeable The traditional sliding guide must be scraped on the rail surface, both laborious and time-consuming, and once the machine tool accuracy is poor, must be scraped again. Rolling guide is interchangeable, as long as the replacement of the slider or guide or the entire rolling guide vice, the machine can regain high accuracy. As mentioned earlier, because the ball in the guideway and the relative motion between the slider for rolling, can reduce the friction loss. Usually rolling coefficient of friction for the sliding coefficient of friction of about 2%, so the transmission mechanism using rolling guide is far superior to the traditional sliding guide. Rolling linear guide vice selection method Rolling linear guide vice has a large carrying capacity, high contact rigidity, high reliability and so on, mainly in the machine tool bed, table guide and column on the upper and lower lifting guide used. We can choose according to the size of the load, the direction of the load, the size of the impact and vibration to choose. 1. Load direction As the rolling linear guide vice slider and guideway usually have 4 rows of circular arc raceway, so can withstand 4 directions of load and overturning moment. Guideway capacity with the increase in the center distance of the raceway and increase. 2. Load size Rolling linear guide different specifications have different carrying capacity, according to the size of the load to choose. In order to make each pair of rolling linear guide have a more ideal service life, according to the selected manufacturers to provide an approximate formula to calculate the rated life and rated hour life, in order to give a reasonable maintenance and replacement cycle. Also consider the slider to bear the load, the impact of each slider rolling resistance, rolling resistance calculation, in order to determine a reasonable driving force. 3. Pre-load selection According to the design of the structure of the impact, vibration and precision requirements, select the appropriate pre-pressure value. The current situation of rolling linear guide vice At present, the foreign production of rolling linear guide vice manufacturers are mainly concentrated in the United States, Britain, Germany and Japan and other countries. Domestic manufacturing of rolling linear guide vice is still in the initial stage, compared with foreign countries, there is still a gap, mainly manifested in the following: fewer varieties, small production, low service life, noise, processing technology is not as advanced as abroad. Nanjing Craft Equipment Manufacturing Plant, Guangdong Kate Precision Machinery Co., Ltd. as the representative of the domestic enterprises, is trying to narrow this gap, some of their products already have the international advanced level. The development trend of linear rolling guide vice Rolling linear guide vice of new types, new functions are now emerging, and are being combined, integrated, high-speed, low noise, intelligent direction. 1. Rolling linear guide vice with ball keep CSK company used ball keeper and ball form an integral part, keep the ball smooth cyclic movement, eliminating the mutual friction between the ball, the development of low noise, maintenance-free, long service life, speed of up to 300m/min ultra-high-speed linear movement of SSR guide vice, and has begun to promote. The guideway vice realized 100m/min movement speed noise is less than 50dB, friction fluctuation is reduced to 1/5 of the previous product, in addition, through a time to add grease 2cm3, running 2800km test. In the future, the linear guide with ball cage will gradually become the mainstream of high-grade CNC machine tool selection. 2. Linear motor and linear guide and use The use of integrated linear motor slide system has a compact structure, running in the power of the characteristics. At the same time, the positioning accuracy of the slide system has also been improved. SKF Linear Systems Ltd. and Pratec linear motor manufacturers to cooperate, and in 1996 has begun to promote the integration of linear motor slide system products. 3. Hybrid tableJapan developed a new type of rolling linear guide vice table, which has a set of sliding electromagnetic block device, can be sucked into the guideway to increase friction in the positioning process to improve the system's vibration-resistant performance, so it is also known as a hybrid table (hybridtablesystem).
4. Rolling linear guide vice made of new materials Due to the diversification of user requirements and the use of different environments, the emergence of rolling linear guide vice made of new materials. For example, the use of stainless steel products made of stainless steel, its guide shaft, slider, ball, sealing end and keeper are made of stainless steel materials, while the reverser using synthetic resin, so the corrosion resistance is improved. For high temperature and vacuum applications, the reverser can be made of stainless steel. In addition, the rolling linear guide vice made of ceramic materials will be developed and applied. At present, the use of linear guide in harsh environments, namely, high dust concentration, strong acid, strong alkali and high corrosion occasions still have certain limitations. But with the increasing perfection of linear guide technology, and linear guide with high speed and control and many other outstanding advantages, as well as a wealth of types and functions, it can be expected that this mechanism as a functional component will be used more and more in CNC machine tools and other machinery and equipment.Web Link